Home / 1,010.30-1,394.58-905.20

Finding the Fourth Proportional to 1,010.30, 1,394.58 and 905.20

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Solution

The fourth proportional to 1,010.30, 1,394.58 and 905.20 is: 1,249.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.30 : 1,394.58 = 905.20 : x
  2. Step 2: Convert to fraction form
    1,010.30/1,394.58 = 905.20/x
  3. Step 3: Cross multiply
    1,010.30x = 1,394.58 × 905.20
  4. Step 4: Simplify right side
    1,010.30x = 1,262,373.82
  5. Step 5: Solve for x
    x = 1,262,373.82/1,010.30
  6. Step 6: Final answer
    x = 1,249.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.